SMI South Central (Smoke Management Instructions) South Central Smoke Management Instructions

[ODF Smoke Management Instructions]

SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS
SALEM FORESTRY WEATHER CENTER
OREGON DEPARTMENT OF FORESTRY

ISSUED: Wednesday, May 6, 2009       2:40 PM      Nick Yonker

1.  DISCUSSION AND FORECAST FOR SOUTH CENTRAL OREGON ZONES 624 AND 625

Upper level trough in the eastern Pacific is ejecting a frontal system through the region today.  Front will move east of the region tonight with moisture diminishing.  Cooler air moving in aloft will lower the snow level down to near 5000 ft tomorrow morning.  With the upper trough moving through tomorrow, expect a chance of continued showers.  Showers should end by Thursday evening.  Air mass will continue unstable and smoke dispersion good through tomorrow.

    OUTLOOK (FRIDAY - SUNDAY):

Flat upper level ridge will dry out and stabilize the air mass early Friday.  However, daytime heating should bring mixing levels up into the good category again.  Generally the pattern will remain dry and tranquil through Sunday.  A trough will approach Sunday and bring a marine push Sunday afternoon.  Air mass will maintain a stable morning, unstable afternoon pattern through the period.  Wind flow will remain mainly light, favoring northerly flow Friday and Saturday, then turning onshore on Sunday.  Smoke dispersion will be mostly fair.

2.  DISPERSION

THURSDAY
Mixing height below 3000 ft early rising to 4300 - 5000 ft by late morning.  Afternoon mixing height rises above 5000 ft then lowers to 2000 - 3000 ft during the evening.

Transport wind W to NW at 9 - 15 mph.

Surface wind WSW to WNW at 6 - 10 mph during the morning.  Surface wind increases to WNW to NW at 10 - 18 mph during the afternoon and evening.

OUTLOOK:

FRIDAY
Mixing height below 1000 ft early rising to 3700 - 4700 ft by late morning rising above 5000 ft during the afternoon.  Transport wind NE to ESE at 6 - 10 mph during the morning becoming light and variable during the afternoon.  Surface wind light and variable during the morning becoming WNW to NNW at 4 - 8 mph during the afternoon.

SATURDAY
Mixing height below 1000 ft early rising to 3500 - 4500 ft by late morning rising above 5000 ft during the afternoon.  Transport wind NNW to NNE at 6 - 10 mph.  Surface wind NNW to NNE at 4 - 8 mph.

SUNDAY
Mixing height below 1000 ft early rising to 3500 - 4500 ft by late morning rising above 5000 ft during the afternoon.  Transport wind SSW to WSW at 8 - 12 mph during the morning becoming W to NW at 10 - 22 mph during the afternoon.  Surface wind SSW to WSW at 6 - 10 mph during the morning becoming W to NW at 10 - 16 mph during the afternoon.

3.  BURNING INSTRUCTIONS FOR ZONES 624 AND 625 INCLUDING THE WALKER
    RANGE PORTION OF ZONE 624
This instruction is valid for burning conducted on Thursday, May 7, 2009.
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Avoid ignitions within 10 miles to the W through NNW of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 15 miles in all directions of SSRAs.

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4.  SPECIAL NOTE:

    The smoke management forecaster is available at (503)
    945-7401.  The smoke management forecaster is available
    to discuss specific burns.  The duty forecaster phone
    number is (503) 945-7401. Please call this number and
    not individual's numbers to discuss daily burning. Please
    avoid calling before 8 a.m. and between 2 to 3 p.m.

    This forecast is available on the Internet at:
      http://oregon.gov/ODF/FIRE/fire.shtml/#Smoke_Management

    Please ensure your units have been planned and accomplished by checking:
      http://oregon.gov/ODF/FIRE/SMP/dailysmoke.shtml


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